在這個例子中，我們將創建一個helloworld例子用Struts2
下面的工具會被使用：
Maven3
Eclipse3.7
Struts2.3.1.2
用maven下載全部的struts2的依賴，在pom.xml中添加struts2-core
File : pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.mkyong.common</groupId>
<artifactId>Struts2Example</artifactId>
<packaging>war</packaging>
<version>com.mkyong.common</version>
<name>Struts2Example Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts2-core</artifactId>
<version>2.3.1.2</version>
</dependency>
</dependencies>
<build>
<finalName>Struts2Example</finalName>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
用struts2 tags寫的jsp頁面用來顯示username和password輸入框，和提交按鈕
Fie : login.jsp
<%@ page contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
<head></head>
<body>
<h1>Struts 2 Hello World Example</h1>
<s:form action="Welcome">
<s:textfield name="username" label="Username" />
<s:password name="password" label="Password" />
<s:submit />
</s:form>
</body>
</html>
<%@ page contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
<head></head>
<body>
<h1>Struts 2 Hello World Example</h1>
<h4>
Hello
<s:property value="username" />
</h4>
</body>
</html>File : WelcomeUserAction.java
package com.dufeng.core;
public class WelcomeUserAction{
private String username;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
// all struts logic here
public String execute() {
return "SUCCESS";
}
}放所有的業務邏輯在裏面，返回一個字符串告訴用戶轉到哪裏。
當然你也可以實現 com.opensymphony.xwork2.Action類，但是它是可選的，因爲
com.opensymphony.xwork2.Action僅僅提供一些常量值。
struts1的action類需要繼承org.apache.struts.action.Action，但是struts2的action
是可選的，但是你仍然可以實現com.opensymphony.xwork2.Action爲一些常量值，或者繼承
com.opensymphony.xwork2.ActionSupport爲一些常用的默認方法。
strut配置文件必須命名struts.xml
File : struts.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <package name="user" namespace="/User" extends="struts-default"> <action name="Login"> <result>/WEB-INF/view/login.jsp</result> </action> <action name="Welcome" class="com.dufeng.core.WelcomeUserAction"> <result name="SUCCESS">/WEB-INF/view/welcome_user.jsp</result> </action> </package> </struts>File web.xml
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>Struts 2 Web Application</display-name>
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
